Gas analyzer



Invent or Att' W. KEMP GAs ANALYZER Filed Sept. l5, 1928 Spt. 1U, 1929.

Patented Sept. 10, 1929.

WILLIAM KEMP, 0F ST. LOUIS, MISSOURI.

GAS ANALYZER.

Application filed September 15, 1928. Serial No. 306,260.

My invention relates to a gas analyzer and particularly to an analyzeroperating on the absorption principle to determine the amount of anabsorbable gas in a mixture contain- 5 ing such gas and another orothers inert to the absorption material. My apparatus is especiallyadapted to indicate the percentage of carbon dioxide contained in fluegases of furnaces.

One object of my invention is to improve the mechanical construction ofsuch an apparatus so that it will be light, strong and durable. Anotherobject of my invention is to provide improved means for supplying auniform flow of gas to the diffusion plate of the device.

In the accompanying drawings, which illustrate one form of analyzer madein accordance with my invention, Figure 1 is a vertical, longitudinalsection; Figure 2 is a top plan view of the absorption chamber; andFigure 3 is a section taken on the line 3-3 of Figure 1.

My apparatus comprises an absorption chamber including means for holdinga diffusion plate in position, an injector for supplying a uniform flowof flue gas to the diffusion plate, and an indicating or recordingdevice communicating with the absorption chamber.

The absorption chamber consists of a rec tangular steel tanlr 5containing the absorption material 6, preferably caustic potashsolution. In the top of the tank 5 is a square opening 7 surrounded by aflange 8 which may be made integral with the tank but which, forconvenience in manufacture, is preferably made separate and Welded inposition. On the flange 8 is a cover 9 held in place by screws 10.Projecting inwardly from the flange 8 is a ledge 11 on which issupported the diffusion plate 12 of porous material, such as asbestosboard. The plate is secured in place by a clamping frame 125 held byscrews 141 in the cover. Leading from the cover is a pipe 15 connectedto the injector. The use of the clamping frame and screws provides asimple and effective means for securing a gas tight joint between the 0flange and the diffusion plate.

The body of the injectorconsists of an up- 19 closes the upper endy ofthe fitting and y, f

carries a nozzle 20. `In the interior of the upper end of the pipe 16 isa plug 21 carrying a small pipe 22 extending down through the pipe 16 toa point past the entrance of the pipe 15. On the lower end of the pipe16 is a T fitting 23 closed by a. plug 24 and connected by a horizontalpipe 25 with` a similar T fitting 26. The upper endy of the fitting 26is closed by a flange27 having a vent 28, and the lower end by a plug 29in which is secured` the overflow pipe 30. This pipe projects above thehorizontal pipe 25 a predetermined distance and thus determines theamount of ypressure under which the flue gas is delivered to thediffusion cham-y ber, from which it escapes through opening 33 in one ofits walls.

The space above the absorption fluid coinmunicates throug a pipe 31 withany suitable indicatingor recording device 32.` 1t

will be understood that the flue gas, before being discharged into. thediffusion chamber, is passed through one or more dehydrating cells toremove all moisture and also through a filter to remove the free carbonand other solid matter; These devices rare not shown as they form nopart of the present invention. l

The operation of my invention is as follows A jet of water is dischargedthrough the nozzle 20 into the pipe 22 carrying with it the flue gasesfrom the pipe 18. Water of condensation collects in the lower end of thepipe 16 passing through pipe 25 into the connection 26 where it forms awater seal. height of the water in the seal depending upon the distanceof the top of the pipe 3() above the horizontal pipe 25 determines thepressure at which the gases are delivered through the pipe 15 to thediffusion chamber. This The pressure will be constant notwithstandingvariations in the pressure of the water delivered by the nozzle andconsequently a uniform flow of gas will be delivered to the diffusionchamber. Any excess of flue gas above rlli eo j

that which can be delivered through pipe 15 at the determined pressureWill be carried over into the trap with the Water and escape throughvent 28. The diffusion chamber is thus supplied with a constant anduniform flow of ue gases which diffuse through the` plate l2 into theabsorption chamber Where the carbon dioxide (CO2) is absorbed by the yliquid 6. As is Well knoWn, under this condition the pressure of thegases in the chamber 5 Will vary in proportion to the amount of carbondioxide in the gas and the variation of pressure is communicated throughpipe 3lv to any suitable instrument 32 Where it is either indicated orrecorded as desired. y

' Having fully described my invention, what I claim as nevi7 and desireto secure by Letters Patent of the United States is:

l. In a device of the class described, the combination with anabsorption chamber provided With an opening in the top, a flangesurrounding said opening, a diffusion plate supported on said flange, a.cap for said flange, and means carried by said cap for clamping thediffusion plate against the flange.

2. In a device of the class described, the combination with anabsorption chamber provided With an opening in the top, a flangesurrounding saidopening. a diffusion plate supported on said flange, acap for said flange, a clamping frame in said cap and bearing on saidplate, and screws in said cap bearing on said frame. y Y 3. 4In a deviceof the class described, the

combination With an absorption chamber provided with a porous plate, ofa diffusion chamber enclosing said plate, an injector for 'supplying vgases to said diffusion chamber, and a liquid seal for determining thepressure at Which said gases are supplied.

4. In a device of the class described, the combination With anabsorption chamber provided with a porous plate, of 'a diusion chamberenclosing said plate, an injector for supplying gases to said diffusionchamber, and a liquid seal communicating with said injector anddetermining the pressure therein, said seal` being provided With a ventfor` surplus gases. c c c In testimony whereof, I hereunto affix mysignature, this'lth day of September, 1928,

Y v VILLIAM KEMP.

